Dust collector



April l, .1952 R. H. GooDRlcH 2,590,958

DUST COLLECTOR Filed Jan. 19, 1950 Q22@ 22mg.

Patented Apr. l, 1952 DUST coLLEoToR Ross Harry Goodrich, Claremont, N. H., assignor to Joy Manufacturingv company,A Pittsburgh, Pa., a corporation of Pennsylvania Application January 19, 1950, Serial No. 139,510

This invention relates to dust collecting means and more particularly to a dust collector especially designed for use with a rock drill for collect ing the dust which emerges from the mouth of the drill hole during the drilling operation.

In rock drills considerable dust is created by the drill bit during the drilling operation and in order to obtain eiective drilling, the dust must be cleared away from the bottom of the hole as drilling progresses. In such rock drills, and particularly in rock drills for drilling upright rooibolt holes in the roof Strata of an underground mine or tunnel, it is highly desirable to collect the dust as it emerges from the mouth of the drill hole to reduce the occupational hazardl it presents and this is especially true in an underground coal mine wherein the excessive suspension of coal dust in the air presents grave danser of an explosion as well as an occupational hazard. Numerous known forms of dust collectors have been devised for use with rock drills for reducing the discharge of dust into the .surrounding air and none have been found entirely adequate for the present use. The present invention contemplates improvements over such known types of dust collectors in that improved dust collecting means is provided whereby the dust created by the drill bit of a rock drill is effectively collected as it emerges from the mouth of the drill hole. The dust collector of the present invention is especially designed for use with a stoper type hammer rock drill for drilling upright anchorbolt holes in the roof strata whereby the dust created by the drill bit is effectively collected near the roof at the hole-mouth and conducted 'to a convenient point of disposal. The dust collector of the present invention isof a simple and rugged construction and is readily adapted for association with a rock drill of a conventional type.

An obj ect of the present invention is to provide an improved dust collector. Another object is to provide an improved dust collector which is especially designed for use with a rock drill. Yet another object is to provide an improved dust collector which has extremely effectivemeans for receiving the dust created by the drill bit .as it emerges from the mouth of the drill hole. A further object is to provide an improveddust co1- lecting means which may .be readily attached to the drill steel of a conventional rock drill, and which embodies a novel dust collecting chamber .and novel air jet means for creating a, partial vacuum in the chamber whereby the dust, as it emerges .from the mouthof .the drill hole, is eiectively drawn into thecollector chamber-and conc claims. (crasssoi 2 veyed to a convenient point Vof disposal. Yet another object is to provide an improved adjustable Support for a dust collector. These and other objects and advantages of the invention will, however, hereinafter more fully appear.

In4 the accompanying drawing there is shown for purposes of illustration one form which 4the invention' may assume in practice.

'hammer rock drill with which an illustrative In this drawing: Fig. l is a side elevational view of a pneumatic form of the improved dust collector is associated.

Fig. '-2 is an enlarged vertical section taken sub'- stantially on the plane of line 2 2 of Fig. 4.

Fig. 3 is an enlarged vertical section taken substantially on the plane of line 3-3 of Fig. 1, showing details of the adjustable support for the dust collector.

Fig. 4 is an enlarged horizontal section taken substantially on the plane of line 4-4 of Fig. l. In this illustrative embodiment of the invention, the improved dust collector is generally designated l and is herein shown associated with a pneumatic hammer rock drill generally designated 2, and is supported by an adjustable sup'- port generally designated 3. Evidently, the dust collector may be associated with drills of other types and may be mounted in other manners.

The hammer rock drill 2 is herein of the wheel mounted stoper type and may be similar to that disclosed in a copending application to John C. Curtis, Serial No. 139,612 filed January 20, 1950, and .herein comprises a wheeled carriage 4 having a frame 5 mounted on wheels 6 and normally held in a horizontal position during the drilling operation by an adjustable foot l attached to the carriage frame. Mounted on this carriage are enacting pneumatic vfeeding devices 8 and 9 for a pneumatic hammer drilling tool l0. The drilling tool isof a conventional design and embodies a pressure uid operated hammer motor II for percussively actuating a drill steel l2 which is provided with a conventional rock drill bit I3. AS is well known to those skilled in the art such rock drills have iluid cleaning means embodied therein-whereby fluid under pressure may be conducted through the drill steel and drill bit to the 'bottom of the drill hole for cleaning the cuttings from the vface of the drill bit, and the dust created by the drill bit as drilling progresses emerges from the mouth of the drill hole. As the drill steelis percussvely actuated to effect drilling of the hole the ,drilling tool may be fed upwardly toward the work by the pneumatic .feeding devices and9 in the manner fully disclosed in the -copending application above referred to.

Now referring to the detail structure of the improved dust collecting means and particularly to the adjustable support 3 for the dust collector, it will be noted that mounted in a suitable manner on the drill carriage is an upright rod I5 which has a tubular upper portion I6 in which is telescopically arranged a slidable rod I1 provided with a pointed upper end I8 adapted for engagement with the roof of the mine passageway or tunnel. This slidable rod carries a cross pin I9 which has its ends projecting out through longitudinal slots in the tubular'rod portion I6 as shown in Fig. 3. A cross pin 2| is secured to the tubular rod portion I6 a substantial distance below the bottoms of the slots 20, and a coil spring 22 surrounding the rod acts between the pins I9 and 2I for constantly urging the slidable rod I1 in an upward direction, thereby yieldingly to hold its pointed end against the roof. If desired, instead of mounting thc upright rod -I5on the carriage of the drill it may have its lower end supported directly by the floor.

The dust collector I has a sleeve 23 slidingly mounted on the rod I1 a substantial distance above the upper end of the rod portion I6 and a horizontal arm 24 is rigidly secured as by welding to the sleeve, and a clust collector housing 25 is carried by this arm, as later explained. Arranged between a cross pin 26 secured tothe rod I1 and a washer 21 abutting the bottom of the sleeve 23, and surrounding the rod I 1, is a coil spring .28 for urging the arm 24 and the collector housing cai'- ried thereby in an upward direction. A cross pin 29 secured to the upper end cf the rod I1 provides a stop for preventing outward displacement of the arm supporting sleeve 23 from the rod I1. The collector housing 25 has a cylindrical portion 30. composed of cooperating parts 3| and 32 hingedlyA connected at 33. Secured as by bolts 34 to the bottom of the housing are superimposed semicircular plates 35 and 35 between which semicircular flexible members or segments 31, preferably composed of rubber or like material, are clamped. The plates and rubber segment'sare re'- `cesse'd at 38 at their inner edges and these recesses, vwhen the housing parts are swung together, cooperate to provide an opening for receiving the drill steel, and the rubber members at their inner surfaces closely yieldingly embrace the steel body. Pivoted at 39 cn the housing part 32 is a rodlike handle 49 providing a shoulder 4I against which a washer 42 is yieldingly held by a :coil spring 43. This spring surrounds the handle body and acts between .a cross pin 44 and the washer 42 for yieldingly holding thelatter against the shoulder 4I. A slotted lug 45 formed on the other housing part 3| has a curved exterior surface 46 which is engageable by the washer 42 when the handle is swung into the slot of the lug 45, as shown in full lines in Fig. 4. The 'spring pressed washer engaging the lug surface 46 yieldingly holds the handle in closed position, with the housing parts held together.

The housing parts of the dust collector co:n

operate to provide a dust collecting cup 48 having a tapered, conical chamber 49 the walls of which converge downwardly and the narrow .lower portion of this tapered chamber extends through a conical depending flange 5B Wliolrplou jects from thev housing down into a circularrecess 5I, with the bottom of the iiange terminating a short distance above the recess bottom 52 which is provided by the upper plate segments 35. The housing part 3l has a lateral conduit 53having its bore 54 opening into the recess 5 I, as shown in Fig. 2. The arm 24 has a laterally bent portion 55 (Fig. 4) which is secured as by welding to the exterior of the conduit 53. A iiexible hose 56 is attached at its upper end to the conduit 53 and at its lower end to one end of a nozzle casing 51 which has a tapered Venturi passage 5B in whose throat a jet nozzle 59 is arranged, the latter being connected by a conduit 60 to a hose 6I which may lead to any suitable source of uid under pressure. The opposite end of the nozzle casing 51 is connected to a flexible hose 62 which may lead to any suitable point of dust disposal.

The wheel mounted stoper drill is shown in drilling position in Fig. l with the hammer motor II percussively actuating the drill steel I2 to cause the drill bit I3 to drill a vertical hole H in the roof rock. The collector housing 25 is clamped around the drill steel in the manner shown and is held in position by the spring extended telescopic supporting rods I5 and I1. During operation of the drill tool uid under pressure is concurrently supplied to the hose 6I which conducts iiuid under pressure to the jet nozzle 59 and asa result a partial vacuum is created in the hose 56, conduit bore 54 and circular recess 5I. As the drill bit elects drilling of the hole the dust created by the drill bit emerges from the mouth of 'the hole, and as the result of the partial vacuum induced by the jet nozzle 59 in the bottom recess 5I, the dust ilows with the commingled air drawn into the top of the cup portion 48 which lies close jto the roof, downwardly through the tapered 'chamber 49, linto the bottom recess, and the dust is drawn from the bottom recess downwardly through the hose 56, through the nozzle casing 51 and hose 62 to the place of disposal which may assume the form of a conventional dust separator. The semicircular rubber segments 41' yieldingly engage the body of the drill steel so that little fluid leakage occurs about the opening through which the drill steel extends thereby insuring an effective drawing in of the dust into the housing recess. By the arrangement of the ta- 4plered` opening 45 and the depending conical ilange S9 lwhich extends down into the housing recess 5I an extremely eiective dust collecting function is attained. Evidently, the housing may be readiiy released from the drill steel simply by swinging out the holding handle 4E! and swinging the housing parts SI and 32 apart. The Venturi type nozzle arrangement together with thefluid jet affords an extremely effective suction creating means with a relatively small consumption of Iluid under pressure. The parts are rugged and simple in design, well adapted for the intended purpose. These and other uses and advantages of the invention will be clearly apparent to those skilled in the art.

.While `there is in this application specically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified jand embodied in various other forms without d'ev'the drm Sten of a rock drin which is adaptedto ydrill a hole in a working face, comprising 'a collector housing surrounding 'the drillsteel land havingl a circular outer wall and an inverted truste-conical portion providing a tapered chamber of circular cross section through which the steel extends and disposable with its wide end close to the working face at the mouth of a drill hole from which dust to be collected emerges during the drilling operation, 'said conical portion having an annular conical flange projecting in'-- wardly and axially from said outer wall, said housing having a circular recess into which said conical ila-nge extends with the end of said ange at the narrow end of said' tapered chamber spaced from the recess bottom, means connected to said housing for creating a suction within said recess whereby dust laden air is drawn into the wide end of and axially through said tapered chamber, the air flowing over the rim of "s'aid corneal flange at the rifarrow end of said chamber into said recess, a discharge passage communicating with said recess andv through which such dust laden air is discharged', said passage opening through the outer circular wall thereof abovethe recess bottom, and sealing means carried by' said housing at the recess ybottom and embracing the steel body to reduce leakage from said recess.

2. A dust collector as set forth in vclaim 1 wherein said circular housing is split and -is composed of hingedly connected parts which have portions which cooperate to provide said chamber and said recess, said sealing means having cooperating sealing elements carried by" said parts, said discharge passage being formed in one of said parts, and releasable means is-provided for securing said parts together.

3. A dust collector as set forth in claim l wherein an adjustable yieldable rodlike support is provided for said dust collector housing for yieldingly maintaining said wide mouth of said tapered chamber in position adjacent the holemouth close to the working face.

4. A dust collector as set forth in claim 1 wherein said suction-:creating means includes a fluid jet arranged in` said discharge passage for creating the suction within said recess and for discharging dust laden air from said recess.

5. A dust collector as set forth in claim 1 wherein said sealing means comprises plate-like annuli secured to said housing at the recess bottom, and a rubber-like annulus clamped between -said plate-likeannuli with the inner periphery thereof pressing against the steel body.

6. A dust collector as set forth in claim 3 wherein said collector housing has a lateral supporting arm formed with a tubular portion slidably guided on said adjustable support, and a spring is provided on said support and on which said tubular portion of said arm rests whereby said housing is yieldably supported in dust col lecting position.

ROSS HARRY GOODRICH.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 551,464 Elliott Dec. 17, 1895 751,253 Brady Feb. 2, 1904 1,003,075 Wahlstrom Sept. 12, '1911 1,131,052 Galligan Mar. 9, 1915 1,850,317 Dikant Mar. 22, 1932 1,930,099 Kelley Oct. 10, 1933 1,969,513 Kelley Aug. '7, 1934 2,041,689 Baumeister et al. May 26, 1936 2,107,552 Smith Feb. 8, 1938 2,145,272 Noble Jan. 31, 1939 2,201,270 McIntyre May 21, 1940 FOREIGN PATENTS Number Country Date 1,922 Germany Feb. 23, 1922 338,730 Germany Oct. 12, 1921 417,865 Great Britain Oct. 12, 1934 

